Update rustyline requirement from 6.2.0 to 8.1.0

[dependabot-preview[bot]]

Updates the requirements on rustyline to permit the latest version.

Release notes

Sourced from rustyline's releases.

8.1.0

• Support Partial Completion (#413, #513)
• Implement CTRL-V support on Windows (#519, #521)
• Support ESC ESC sequences, and bind alt+left/alt+right (#517)
• Implement Candidate for &'static str (#443, #512)
• Fix KeyEvent::encode (#509, #511)
• Fix line wrap predicate (#523)
• Replace fs2 dependency by fd-lock (#505, #507, #522)

Commits

• 35d84a4 Fix line wrap predicate (#523)
• 370fc5b Fix clippy warnings (#525)
• 957a677 Merge pull request #524 from gwenn/8.1.0
• 12738f1 Prepare release of version 8.1.0
• 7958675 Merge pull request #517 from thomcc/escesc
• d48d012 Merge pull request #521 from marcbowes/winclip
• 7081b23 Merge pull request #522 from marcbowes/winapi-std
• 307bd32 Enable 'std' for winapi, fixes #520
• a260289 Run cargo fmt
• e1c1d0e C-v on Windows will now paste from the clipboard
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #74.